Pressure lantern



July 3, 1934.

W. B. ENGH ET AL.

PRES SURE LANTERN Filed March 9, 1931 Z 7a 0&0202;

2 Sheets-Sheet l Patented July 3, 1934 UNITED STATES PATENT orrice PRESSURE LANTERN poration of Illinois Application March 9, 1931, Serial No. 521,270

18 Claims. (o1. 67-49) The invention relates to lanterns of the type wherein liquid fuel is vaporized and burned to produce a mantle-heating flame, and it especially concerns certain elements thereof whereby the liquid fuel may be vaporized without producing carbon deposits in inaccessible or unremovable elements of the device, as well as a novel construction whereby the hood of such a lantern is readily manufactured.

Said invention is embodied in a lantern having, as usual, a liquid-fuel reservoir, a vaporizing tube, a mixing tube, and a blue-flame burner in which the vaporized liquid fuel, mixed with air, is burned, but which is so constructed that I vaporization of the liquid fuel is confined to the vaporizing tube which may be taken out and cleaned or replaced by a new vaporizer.

The invention will be best understood by referring to the drawings, constituting a part of this specification, in which Figure l is a view in elevation of the lantern, parts thereof being broken away to show interior features of construction;

Figure 2 is a sectional View taken on the line 2-2 of Figure 1;

Figure 3 is a vertical sectional view taken on the line 3-3 of Figure 2, showing means for separably uniting the fuel duct of the burner and the vaporizer;

Figure 4 is an enlarged sectional View of the upper part of the lantern;

Figure 5 is a horizontal sectional view taken on the line 55 of Figure 4, and

Figure 6 is a fragmentary view showing a clip for uniting parts of the body of the lantern.

Referring to the drawings, 1 is the reservoir for liquid fuel which, preferably, is a heavy hydrocarbon, said reservoir being associated with any suitable pneumatic means for displacing the liquid fuel.

Leading from the bottom of said reservoir is a duct 2, controlled by a valve 2a and extending upward outside of the chimney of the lantern, through which duct 2 the liquid fuel may flow to the horizontal and curved vaporizer 3 which discharges the vaporized fuel from a small orifice 4 into the proximate end 5 of the vertical and curved mixing tube 6 from which a mixture of vapor and air is delivered to the burner 7, on which an inverted mantle 8 is sustained.

The initial end '9 :of the vaporizer .3 is disposed outside of the chimney of the lantern, and is provided with a block 10 having a cavity 11 into which said initial en'd'Q :is secured, and said block 10 also has a passage 12 communicating with said cavity 11 through which liquid fuel may flow from the duct 2 into the vaporizer 3, the block 10 being provided with a conical projection 13 which accurately fits a conical cavity i l at the end of said duct 2.

The block 10 is enclosed by a yoke 15 that is connected with the upper end of the duct 2 by a screw-threaded sleeve 16, and said yoke has at its upper end an adjustable screw 17 by means of which said block 10 may be thrust downward to force its conical projection 13 into the conical cavity 14 of the duct 2, so as to produce a liquid tight union at that point, one of these elements being made of soft metal. The vertical dimension of the space within the yoke 15 is such that, when the adjustable screw 17 is retracted, the block 10 may be raised suiiiciently to lift its conical projection 13 from the conical cavity 14 of the duct 2 and thus permit said block 10 and the attached vaporizer 3 to be removed from said yoke 15.

It is essential that this vaporizer 3 be thus removable in order that, if clogged, it may be replaced by another vaporizer. The curved body of said vaporizer 3 lies close to, but not in contact with the burner 7 and the mantle 8, so that the as yet unheated liquid fuel supplied by the duct 2 will'quickly be vaporized, the object of thus 10- calizing vaporization being to avoid dissociation of the liquid fuel and consequent deposition of deposits in any part of the device which cannot readily be cleaned or removed. It is for this reason that the duct 2 is disposed outside of the body of the lantern where it will remain cool. Furthermore, the disposition of said vaporizer where it is subjected not only to the heat of the hot products of combustion, but also to the radiant heat of the mantle, results in a marked decrease in the quantity of fuel required to produce a given candle power.

The burner '7 is carried by the annular removable hood 18 which is provided with inwardlyextending arms 19 that terminate in and support a hub 20 with which said burner 7 is suitably connected, and this hood, which also carries the mixing tube 6, has a flange 21 which overlies a flange 22 on the body of the lantern and is clamped to said flange 22 by pivoted U- shaped clips 23 which hold the hood 18 in fixed relation to the body of the lantern.

This removable hood 18 comprises a vertical outer wall 24 having an inturned flange 25 at its upper end, an annulus 26 constituting the bottom of said hood, and a cylinder 27 through which products of combustion may escape from the space within the lantern. The inwardlyextending arms 19 which support the burner 7 have strengthening flanges 19a, and the hub 20 has spaced inturned flanges 20a which overlap flange 28 projecting outward from the inner burner tube 29. A nipple 30, with which the discharge end 60, of the mixing tube 6 telescopes, extends through the hub 20 and is held therein by a bead 30a and a flange 30b.

The burner 7 has an outer wall 31 that is secured to the hub 20 by inturned flanges 31a that extend upward between the arms 19 and overlap the hub 20, and is provided with an inturned flange 31b at its lower end between which and the lower end of the inner burner tube 29 by a wire gauze screen is secured.

The hood, as thus constructed, is especially advantageous in that the essential parts thereof may be readily and economically stamped from sheet metal, and in that the surfaces over which the combustible mixture and the air pass are of such character as will not materially retard the flow thereof.

The chimney of the lantern is provided with the usual door, and this door, when opened, will permit the introduction of a preheating torch by means of which the vaporizer may be heated and the liquid fuel therein vaporized preparatory to igniting the burner. The torch may then be used to light the burner.

For convenience in determining the position of the hood relatively to the body of the lantern whereby, when assembling these two elements, the jet orifice 4 of the vaporizer 3 will truly align with the axis of the mixing tube 6, the annulus 26 is provided with a depending tubular guide 32 coinciding with said mixing tube and into which the discharge end of said vaporizer may be inserted only when said lantern body and said hood are in their required relative angular positions. As will be seen, the discharge end of the vaporizer 3 rises above the annulus 26, and, if the body of the lantern and the hood are not properly assembled, said discharge end will contact with the under surface of said annulus and prevent said hood from being seated on and secured to the body of the lantern.

Having thus described our invention, what we claim is:

1. An article of manufacture for use with pressure lamps, comprising a curved vaporizer, one end of which is parallel with and shorter than the other and is provided with a jet orifice for vapor which discharges in a direction at a right angle to the plane in which said ends lie.

2. An article of manufacture, comprising a curved vaporizer, one end of which is shorter than the other and is provided with a jet orifice for vapor, and the other and longer end of which is provided with a hollow block which is to be united to a fuel duct.

3. An article of manufacture, comprising a curve U-shaped vaporizer, both arms of which lie in the same plane, having at one end a jet orifice for vaporized fuel, arranged to discharge in a direction at a right angle to said plane, and having at the other end an inlet for liquid fuel arranged to receive fuel flowing in the same direction.

4. A pressure lantern including a unitary removable hood including an annulus having inwardly-projecting arms, a burner sustained by said arms, and a mixing tube carried by said hood and leading to said burner.

5. A pressure lantern including a body portion carrying a vaporizer, and a unitary detachable hood carrying a mixing tube as well as a pendant burner that is encircled by said vaporizer.

6. A pressure lantern including a reservoir, a fuel duct, a yoke attached to the upper end of said fuel duct, a vaporizing tube, an intake terminal for said tube disposed within said yoke and adapted to fit said upper end of the fuel duct, and means associated with said yoke and holding said vaporizer and said fuel duct in operative relation to each other.

7. A pressure lantern having a removable hood, a vertical mixing tube and a downwardly-projecting tubular guide aligned with said mixing tube, both carried by said hood, and a vaporizer carried by the body of said lantern, the relations of the parts being such that said hood can be operatively connected with said lantern only when the discharge end of said vaporizer is aligned with said guide.

8. A hood for a lantern, including an annular plate that is provided with means for holding a burner in spaced relation to its inner edge, a cylindrical wall constituting an outlet passage for products of combustion, and a mixing tube having its initial end disposed outside of and its other end disposed inside of said cylindrical wall.

9. A lantern, including a unitary hood having an annular chamber through which air to be mixed with vapor may flow, a vapor jet orifice leading into said annular chamber, and a curved mixing tube having its initial end aligned with said jet orifice, and having its discharge end disposed centrally within and separated from said annular chamber to afford a passage for the escaping products of combustion.

10. A hood for a lantern, including an outer wall having an inturned flange at its top, an annular plate constituting the bottom of said hood and provided with unitary means for holding a burner in spaced relation to its inner edge, and a cylindrical inner wall constituting an outlet passage for products of combustion.

11. A hood for a pressure lantern including an annular bottom plate having spacing arms for supporting an inverted burner, openings between said arms for the escape of products of combustion, and an opening in said bottom plate exterior of said arms for receiving the terminal end of a vaporizer.

12. A hood for a lantern, including an annular metal plate having inwardly-extending arms, a hub sustained by said arms and provided with inturned flanges, and a burner tube having at its upper end a flange underlying and clamped by said inturned flanges to thereby secure said burner tube to said hub.

13. A pressure lantern, including a liquid-fuel reservoir, a vertical fuel duct leading from said reservoir and disposed and terminating outside of the body of said lantern, a yoke also disposed outside of said lantern and into which said fuel duct extends, a hollow block separably connected with and enclosed by said yoke, a vaporizer communicating at one end with said hollow block and having a vertically-disposed discharge orifice at its other end, a mixing tube, and a mantle-supporting burner communicating with said mixing tube and surrounded by said vaporizer.

14. A pressure lantern, including a liquid-fuel reservoir, a vertical fuel duct leading from said reservoir and disposed and terminating outside of the body of said lantern, a yoke also disposed outside of said lantern and into which said fuel duct extends, a hollow block separably connected with and enclosed by said yoke, a vaporizer communicating at one end with said hollow block and having a vertically-disposed discharge orifice at its other end, a mixing tube having a downwardly-directed outlet, and a mantlesupporting burner communicating with said mixing tube and surrounded by said vaporizer.

15. A pressure lantern, including a liquid-fuel reservoir, a vertical fuel duct leading from said reservoir and disposed and terminating outside of the body of said lantern, a yoke also disposed outside of said lantern and into which said fuel duct extends, a hollow block separably connected with and enclosed by said yoke and having a conical projection fitting the upper end of said fuel duct, a vaporizer communicating at one end with said hollow block and having a verticallydisposed discharge orifice at its other end, a mixing tube, and a mantle-supporting burner communicating with said mixing tube and surrounded by said vaporizer.

16. A pressure lantern, including a liquid-fuel reservoir, a vertical fuel duct leading from said reservoir and disposed and terminating outside of the body of said lantern, a yoke also disposed outside of said lantern and into which said fuel duct extends, a hollow block separably connected with and enclosed by said yoke, a curved vaporizer communicating at one end with said hollow block and having a vertically-disposed discharge orifice at its other end, a mixing tube, and a mantle supporting burner communicating with said mixing tube and surrounded by said vaporizer.

17. A pressure lantern, including a liquid-fuel reservoir, a vertical fuel duct leading from said reservoir and disposed and terminating outside of the body of said lantern, a yoke also disposed outside of said lantern and into which said fuel duct extends, a hollow block separably connected with and enclosed by said yoke, a curved vaporizer having one end shorter than the other and communicating at said shorter end with said hollow block and having a vertically-disposed discharge orifice at its other end, a mixing tube, and a mantle-supporting burner communicating with said mixing tube and surrounded by said vaporizer.

18. A pressure lantern, including a body portion, a removable hood, a mixing tube carried by said removable hood, a fuel duct leading upward outside of said body portion and terminating near said removable hood, a burner carried by said removable hood, and a horizontally-disposed vaporizer surrounding said burner, detachably connected with the upper extremity of said fuel duct at one end and having at its other end a jet orifice aligned with said mixing tube.

WALTER B. ENGH. CORTLAND W. DAVIS. 

